NAG Library Function Document

nag_sparse_nsym_basic_diagnostic (f11bfc)

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1 Purpose

nag_sparse_nsym_basic_diagnostic (f11bfc) is the third in a suite of three functions for the iterative solution of a real general (nonsymmetric) system of simultaneous linear equations (see Golub and Van Loan (1996)). nag_sparse_nsym_basic_diagnostic (f11bfc) returns information about the computations during an iteration and/or after this has been completed. The first function of the suite, nag_sparse_nsym_basic_setup (f11bdc), is a setup function; the second function, nag_sparse_nsym_basic_solver (f11bec), is the iterative solver itself.

These three functions are suitable for the solution of large sparse general (nonsymmetric) systems of equations.

On entry: the dimension of the array work (see also Section 5 in nag_sparse_nsym_basic_setup (f11bdc)).

Constraint:
lwork≥100.

Note: although the minimum value of lwork ensures the correct functioning of nag_sparse_nsym_basic_diagnostic (f11bfc), a larger value is required by the iterative solver nag_sparse_nsym_basic_solver (f11bec) (see also Section 5 in nag_sparse_nsym_basic_setup (f11bdc)).